The angle bisectors of the three angles of XYZ, intersect at the incenter of the circle. With that incenter a circle can be drawn to touch the three sides internally. 6.
To comply with Navigation Rules and for distress signaling purposes all boats must carry a sound producing device (whistle, horn, siren, etc.) capable of a 4-second blast audible for Â½ mile. *Boats larger than 39.4 ft. are no longer required to have a bell (see Navigation Rules.)
The third objective of this unit on sound will be to increase students' awareness of the sounds they hear, such as higher intensity sound waves produce louder sounds and that all sounds are produced by vibrating objects, such as strings, straws, glasses, and their vocal chords.